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That year, walking past the window of a store long closed, I saw a hand-written,
photocopied flyer that advertised "vegan dog and cat food." I had my suspicions, but
rather than counter one assumption with another, I asked my cats' vet about it.

Our vet said that vegetarian diets are sometimes prescribed for dogs, especially if they
need to lose weight. "But cats are strict carnivores and couldn't live on a vegan diet."

So this is yet another example of what can happen when people decide that their issue is "a
higher truth," more important than so-called facts. It tends to happen in any group, left
or right, religious or anti-religious, any group at all where people have become ever more
like thinking, with an ever-narrowing range of views. It's intellectual inbreeding, and
it's only more obvious with religion(including atheism) and politics. Not everyone, or every
group is like this, but the crankier they are, the more likely they've placed ideological
purity ahead of open-minded thinking.